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From aaron morton <aa...@thelastpickle.com>
Subject Re: Flushing behavior in Cassandra 0.8
Date Tue, 21 Jun 2011 12:01:45 GMT
The new memtable_total_space_in_mb option is kicking in 

https://github.com/apache/cassandra/blob/cassandra-0.8.0/NEWS.txt#L34
http://thelastpickle.com/2011/05/04/How-are-Memtables-measured/

Cheers

-----------------
Aaron Morton
Freelance Cassandra Developer
@aaronmorton
http://www.thelastpickle.com

On 21 Jun 2011, at 22:12, Rene Kochen wrote:

> I try to understand the flushing behavior in Cassandra 0.8
>  
> When I create rows, after a few seconds, I see the following line in the log:
>  
> INFO 11:18:46,470 flushing high-traffic column family ColumnFamilyStore(table='Traxis',
columnFamily='Customers')
> INFO 11:18:46,471 Enqueuing flush of Memtable-Customers@14306556(697958/50059836 serialized/live
bytes, 30346 ops)
> INFO 11:18:46,472 Writing Memtable-Customers@14306556(697958/50059836 serialized/live
bytes, 30346 ops)
> INFO 11:18:47,415 Completed flushing C:\Cassandra\Storage\data\Traxis\Customers-g-1-Data.db
(4157370 bytes)
>  
> The super-column-family is configured as follows:
>  
> Memtable thresholds: 0.2953125/63/1440 (millions of ops/MB/minutes):
>  
> I don’t think any of the three tresholds should trigger the flush?
>  
> Thanks,
>  
> Rene


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